<?php
    session_start();
?>
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>会员管理系统</title>
    <style>
        .main{width:80%; margin:0; text-align:center}
        h2{font-size:16px}
        h2 a{color:navy; text-decoration; none;margin-right:15px}
        h2 a:last-child{margin-right: 0}
        h2 a:hover{color:brown; text-decoration:underline}  /*悬停hover效果 */
    </style>
</head>
<body>
    <div class="main">
       <?php include_once "nav.php" ?>
    </div>
</body>
</html>